Sodium hydrogen carbonate 7.5 percent

Sodium hydrogen carbonate, also called baking soda. Is an active ingredient in some antacids used for the relief of indigestion. Determine the percent composition of sodium hydrogen carbonate (NaHCOj). 

An antacid tablet that contains sodium hydrogen carbonate is titrated with 0.200M HCl. If 0.400 g of the tablet requires 22.0 mL of HCl to reach the endpoint, what is the mass percent of NaHC03 in the tablet ... 

Stoichiometry deals with the mass relationships between reactants and products in chemical reactions. The primary bases of stoichiometry are the balanced chemical equation and the mole concept. In this experiment the concepts of stoichiometry will be used to calculate the percent composition of a mixture composed of sodium hydrogen carbonate (sodium bicarbonate), NaHC03, and sodium carbonate, Na2C03. The number of moles of reactants and products will be calculated using only experimental mass measurements. When an analytical procedure that is used to determine the stoichiometry of a reaction involves only mass measurements, the analysis is called a... 

If 150 mL of 0.055 M HNO3 are needed to completely neutralize 1.48 g of an impure sample of sodium hydrogen carbonate (baking soda), what percent of the sample is baking soda ... 

Gaseous Effluents. Twenty percent of the carbon disulfide used in xanthation is converted into hydrogen sulfide (or equivalents) by the regeneration reactions. Ninety to 95% of this hydrogen sulfide is recoverable by scmbbers that yield sodium hydrogen sulfide for the tanning or pulp industries, or for conversion back to sulfur. Up to 60% of the carbon disulfide is recyclable by condensation from rich streams, but costly carbon-bed... 

Fowler further concludes "My major thente has been that till of the heavy elements from carbon to uranium have been synthesized in stars. Our bodies consist lor the most part of these heavy elements. Apart from hydrogen, wc are 65 percent oxygen and 18 percenl carbon, with smaller percentages of nitrogen, sodium, magnesium, phosphorus, sulfur, chlorine, potassium, and traces of still heavier elements. Thus, it Is possible to say that each one of us and all of us are truly and literally a little bit of stardust."... 

Another important class of carbon compounds, the cyanides, contain the anion group C=N . Cyanide ions are extremely toxic because they bind almost irreversibly to the Fe(III) ion in cytochrome oxidase, a key enzyme in metabolic processes. Hydrogen cyanide, which has the aroma of bitter almonds, is even more dangerous because of its volatility (b.p. 26°C). A few tenths of 1 percent by volume of HCN in air can cause death within minutes. Hydrogen cyanide can be prepared by treating sodium cyanide or potassium cyanide with acid ... 

Still, the most important use of sodium chloride by far is as a raw material in the production of other compounds. In 2004, 65 percent of all the sodium chloride consumed in the United States was used in the production of sodium hydroxide, sodium carbonate, hydrogen chloride, sodium metal, chlorine gas, and other chemical products. The next most important use of sodium chloride is in water conditioners. The compound is used in such devices because the sodium in sodium chloride will replace the calcium and magnesium in hard water (water in which it is hard to make suds). By softening water with sodium chloride, clothing and other materials can be cleaned more efficiently at lower cost. The Salt Institute claims that sodium chloride has more than 14,000 distinct uses. Some of the most important of those uses include ... 

Product Recovery and Analysis. After the autoclave had cooled completely, the gas product was vented. The typical gas composition included nearly equal parts of hydrogen and carbon dioxide with a 10-15 percent residual amount of carbon monoxide and minor amounts of hydrocarbons. [These results suggest a strong water-gas shift reaction as catalyzed by the sodium carbonate base (20).] The autoclave was then opened and the liquid product was collected. The autoclave was rinsed with acetone and the resulting wash solution filtered. The liquid product (approximately 250 g) was acidified to pH 2 with dilute HCl and then extracted with methylene chloride (3 X 40 ml). 

Returning to our mysterious demonstration, the material could have been polyamide 610, synthesized via interfacial polymerization. Then elemental analysis would show the percent nitrogen, carbon, oxygen, and hydrogen, and each of the methods described above would be brought to play their roles. Ik however, it was concentrated hydrochloric acid and concentrated sodium hydroxide that were mixed, the result would eventually be shown to be sodium chloride, ordinary salt Philosophically, of course, conclusions are the product of reasoning power. It must be remembered that experiments provide evidence, and nothing else. 

Tail gas emissions are controlled by improving the SO2 conversion efficiency and by scrubbing the tail gas. In a double-absorption process plant, a five-bed converter has 0.3 percent unconverted SO2, as compared to 0.5 percent for a four-bed converter. A Lurgi Peracidox scrubber may be used to remove up to 90 percent of the residual SO2 in the tail gas from a double-absorption plant. Hydrogen peroxide or electrolytically produced peroxymonosulfuric acid is used to convert the SO2 to H2SO4 in the Lurgi scrubber. Tail gas from single-absorption plants may be absorbed on activated carbon (Sulfacid) or scrubbed with ammonia or sodium sulfite (Wellman-Lord). 

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